drivers/media/pci/pt1/va1j5jf8007t.c

   1 /*
   2  * ISDB-T driver for VA1J5JF8007/VA1J5JF8011
   3  *
   4  * Copyright (C) 2009 HIRANO Takahito <hiranotaka@zng.info>
   5  *
   6  * based on pt1dvr - http://pt1dvr.sourceforge.jp/
   7  *      by Tomoaki Ishikawa <tomy@users.sourceforge.jp>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/i2c.h>
  24 #include "dvb_frontend.h"
  25 #include "dvb_math.h"
  26 #include "va1j5jf8007t.h"
  27
  28 enum va1j5jf8007t_tune_state {
  29         VA1J5JF8007T_IDLE,
  30         VA1J5JF8007T_SET_FREQUENCY,
  31         VA1J5JF8007T_CHECK_FREQUENCY,
  32         VA1J5JF8007T_SET_MODULATION,
  33         VA1J5JF8007T_CHECK_MODULATION,
  34         VA1J5JF8007T_TRACK,
  35         VA1J5JF8007T_ABORT,
  36 };
  37
  38 struct va1j5jf8007t_state {
  39         const struct va1j5jf8007t_config *config;
  40         struct i2c_adapter *adap;
  41         struct dvb_frontend fe;
  42         enum va1j5jf8007t_tune_state tune_state;
  43 };
  44
  45 static int va1j5jf8007t_read_snr(struct dvb_frontend *fe, u16 *snr)
  46 {
  47         struct va1j5jf8007t_state *state;
  48         u8 addr;
  49         int i;
  50         u8 write_buf[1], read_buf[1];
  51         struct i2c_msg msgs[2];
  52         s32 word, x, y;
  53
  54         state = fe->demodulator_priv;
  55         addr = state->config->demod_address;
  56
  57         word = 0;
  58         for (i = 0; i < 3; i++) {
  59                 write_buf[0] = 0x8b + i;
  60
  61                 msgs[0].addr = addr;
  62                 msgs[0].flags = 0;
  63                 msgs[0].len = sizeof(write_buf);
  64                 msgs[0].buf = write_buf;
  65
  66                 msgs[1].addr = addr;
  67                 msgs[1].flags = I2C_M_RD;
  68                 msgs[1].len = sizeof(read_buf);
  69                 msgs[1].buf = read_buf;
  70
  71                 if (i2c_transfer(state->adap, msgs, 2) != 2)
  72                         return -EREMOTEIO;
  73
  74                 word <<= 8;
  75                 word |= read_buf[0];
  76         }
  77
  78         if (!word)
  79                 return -EIO;
  80
  81         x = 10 * (intlog10(0x540000 * 100 / word) - (2 << 24));
  82         y = (24ll << 46) / 1000000;
  83         y = ((s64)y * x >> 30) - (16ll << 40) / 10000;
  84         y = ((s64)y * x >> 29) + (398ll << 35) / 10000;
  85         y = ((s64)y * x >> 30) + (5491ll << 29) / 10000;
  86         y = ((s64)y * x >> 30) + (30965ll << 23) / 10000;
  87         *snr = y >> 15;
  88         return 0;
  89 }
  90
  91 static int va1j5jf8007t_get_frontend_algo(struct dvb_frontend *fe)
  92 {
  93         return DVBFE_ALGO_HW;
  94 }
  95
  96 static int
  97 va1j5jf8007t_read_status(struct dvb_frontend *fe, enum fe_status *status)
  98 {
  99         struct va1j5jf8007t_state *state;
 100
 101         state = fe->demodulator_priv;
 102
 103         switch (state->tune_state) {
 104         case VA1J5JF8007T_IDLE:
 105         case VA1J5JF8007T_SET_FREQUENCY:
 106         case VA1J5JF8007T_CHECK_FREQUENCY:
 107                 *status = 0;
 108                 return 0;
 109
 110
 111         case VA1J5JF8007T_SET_MODULATION:
 112         case VA1J5JF8007T_CHECK_MODULATION:
 113         case VA1J5JF8007T_ABORT:
 114                 *status |= FE_HAS_SIGNAL;
 115                 return 0;
 116
 117         case VA1J5JF8007T_TRACK:
 118                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
 119                 return 0;
 120         }
 121
 122         BUG();
 123 }
 124
 125 struct va1j5jf8007t_cb_map {
 126         u32 frequency;
 127         u8 cb;
 128 };
 129
 130 static const struct va1j5jf8007t_cb_map va1j5jf8007t_cb_maps[] = {
 131         {  90000000, 0x80 },
 132         { 140000000, 0x81 },
 133         { 170000000, 0xa1 },
 134         { 220000000, 0x62 },
 135         { 330000000, 0xa2 },
 136         { 402000000, 0xe2 },
 137         { 450000000, 0x64 },
 138         { 550000000, 0x84 },
 139         { 600000000, 0xa4 },
 140         { 700000000, 0xc4 },
 141 };
 142
 143 static u8 va1j5jf8007t_lookup_cb(u32 frequency)
 144 {
 145         int i;
 146         const struct va1j5jf8007t_cb_map *map;
 147
 148         for (i = 0; i < ARRAY_SIZE(va1j5jf8007t_cb_maps); i++) {
 149                 map = &va1j5jf8007t_cb_maps[i];
 150                 if (frequency < map->frequency)
 151                         return map->cb;
 152         }
 153         return 0xe4;
 154 }
 155
 156 static int va1j5jf8007t_set_frequency(struct va1j5jf8007t_state *state)
 157 {
 158         u32 frequency;
 159         u16 word;
 160         u8 buf[6];
 161         struct i2c_msg msg;
 162
 163         frequency = state->fe.dtv_property_cache.frequency;
 164
 165         word = (frequency + 71428) / 142857 + 399;
 166         buf[0] = 0xfe;
 167         buf[1] = 0xc2;
 168         buf[2] = word >> 8;
 169         buf[3] = word;
 170         buf[4] = 0x80;
 171         buf[5] = va1j5jf8007t_lookup_cb(frequency);
 172
 173         msg.addr = state->config->demod_address;
 174         msg.flags = 0;
 175         msg.len = sizeof(buf);
 176         msg.buf = buf;
 177
 178         if (i2c_transfer(state->adap, &msg, 1) != 1)
 179                 return -EREMOTEIO;
 180
 181         return 0;
 182 }
 183
 184 static int
 185 va1j5jf8007t_check_frequency(struct va1j5jf8007t_state *state, int *lock)
 186 {
 187         u8 addr;
 188         u8 write_buf[2], read_buf[1];
 189         struct i2c_msg msgs[2];
 190
 191         addr = state->config->demod_address;
 192
 193         write_buf[0] = 0xfe;
 194         write_buf[1] = 0xc3;
 195
 196         msgs[0].addr = addr;
 197         msgs[0].flags = 0;
 198         msgs[0].len = sizeof(write_buf);
 199         msgs[0].buf = write_buf;
 200
 201         msgs[1].addr = addr;
 202         msgs[1].flags = I2C_M_RD;
 203         msgs[1].len = sizeof(read_buf);
 204         msgs[1].buf = read_buf;
 205
 206         if (i2c_transfer(state->adap, msgs, 2) != 2)
 207                 return -EREMOTEIO;
 208
 209         *lock = read_buf[0] & 0x40;
 210         return 0;
 211 }
 212
 213 static int va1j5jf8007t_set_modulation(struct va1j5jf8007t_state *state)
 214 {
 215         u8 buf[2];
 216         struct i2c_msg msg;
 217
 218         buf[0] = 0x01;
 219         buf[1] = 0x40;
 220
 221         msg.addr = state->config->demod_address;
 222         msg.flags = 0;
 223         msg.len = sizeof(buf);
 224         msg.buf = buf;
 225
 226         if (i2c_transfer(state->adap, &msg, 1) != 1)
 227                 return -EREMOTEIO;
 228
 229         return 0;
 230 }
 231
 232 static int va1j5jf8007t_check_modulation(struct va1j5jf8007t_state *state,
 233                                          int *lock, int *retry)
 234 {
 235         u8 addr;
 236         u8 write_buf[1], read_buf[1];
 237         struct i2c_msg msgs[2];
 238
 239         addr = state->config->demod_address;
 240
 241         write_buf[0] = 0x80;
 242
 243         msgs[0].addr = addr;
 244         msgs[0].flags = 0;
 245         msgs[0].len = sizeof(write_buf);
 246         msgs[0].buf = write_buf;
 247
 248         msgs[1].addr = addr;
 249         msgs[1].flags = I2C_M_RD;
 250         msgs[1].len = sizeof(read_buf);
 251         msgs[1].buf = read_buf;
 252
 253         if (i2c_transfer(state->adap, msgs, 2) != 2)
 254                 return -EREMOTEIO;
 255
 256         *lock = !(read_buf[0] & 0x10);
 257         *retry = read_buf[0] & 0x80;
 258         return 0;
 259 }
 260
 261 static int
 262 va1j5jf8007t_tune(struct dvb_frontend *fe,
 263                   bool re_tune,
 264                   unsigned int mode_flags,  unsigned int *delay,
 265                   enum fe_status *status)
 266 {
 267         struct va1j5jf8007t_state *state;
 268         int ret;
 269         int lock = 0, retry = 0;
 270
 271         state = fe->demodulator_priv;
 272
 273         if (re_tune)
 274                 state->tune_state = VA1J5JF8007T_SET_FREQUENCY;
 275
 276         switch (state->tune_state) {
 277         case VA1J5JF8007T_IDLE:
 278                 *delay = 3 * HZ;
 279                 *status = 0;
 280                 return 0;
 281
 282         case VA1J5JF8007T_SET_FREQUENCY:
 283                 ret = va1j5jf8007t_set_frequency(state);
 284                 if (ret < 0)
 285                         return ret;
 286
 287                 state->tune_state = VA1J5JF8007T_CHECK_FREQUENCY;
 288                 *delay = 0;
 289                 *status = 0;
 290                 return 0;
 291
 292         case VA1J5JF8007T_CHECK_FREQUENCY:
 293                 ret = va1j5jf8007t_check_frequency(state, &lock);
 294                 if (ret < 0)
 295                         return ret;
 296
 297                 if (!lock)  {
 298                         *delay = (HZ + 999) / 1000;
 299                         *status = 0;
 300                         return 0;
 301                 }
 302
 303                 state->tune_state = VA1J5JF8007T_SET_MODULATION;
 304                 *delay = 0;
 305                 *status = FE_HAS_SIGNAL;
 306                 return 0;
 307
 308         case VA1J5JF8007T_SET_MODULATION:
 309                 ret = va1j5jf8007t_set_modulation(state);
 310                 if (ret < 0)
 311                         return ret;
 312
 313                 state->tune_state = VA1J5JF8007T_CHECK_MODULATION;
 314                 *delay = 0;
 315                 *status = FE_HAS_SIGNAL;
 316                 return 0;
 317
 318         case VA1J5JF8007T_CHECK_MODULATION:
 319                 ret = va1j5jf8007t_check_modulation(state, &lock, &retry);
 320                 if (ret < 0)
 321                         return ret;
 322
 323                 if (!lock)  {
 324                         if (!retry)  {
 325                                 state->tune_state = VA1J5JF8007T_ABORT;
 326                                 *delay = 3 * HZ;
 327                                 *status = FE_HAS_SIGNAL;
 328                                 return 0;
 329                         }
 330                         *delay = (HZ + 999) / 1000;
 331                         *status = FE_HAS_SIGNAL;
 332                         return 0;
 333                 }
 334
 335                 state->tune_state = VA1J5JF8007T_TRACK;
 336                 /* fall through */
 337
 338         case VA1J5JF8007T_TRACK:
 339                 *delay = 3 * HZ;
 340                 *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
 341                 return 0;
 342
 343         case VA1J5JF8007T_ABORT:
 344                 *delay = 3 * HZ;
 345                 *status = FE_HAS_SIGNAL;
 346                 return 0;
 347         }
 348
 349         BUG();
 350 }
 351
 352 static int va1j5jf8007t_init_frequency(struct va1j5jf8007t_state *state)
 353 {
 354         u8 buf[7];
 355         struct i2c_msg msg;
 356
 357         buf[0] = 0xfe;
 358         buf[1] = 0xc2;
 359         buf[2] = 0x01;
 360         buf[3] = 0x8f;
 361         buf[4] = 0xc1;
 362         buf[5] = 0x80;
 363         buf[6] = 0x80;
 364
 365         msg.addr = state->config->demod_address;
 366         msg.flags = 0;
 367         msg.len = sizeof(buf);
 368         msg.buf = buf;
 369
 370         if (i2c_transfer(state->adap, &msg, 1) != 1)
 371                 return -EREMOTEIO;
 372
 373         return 0;
 374 }
 375
 376 static int va1j5jf8007t_set_sleep(struct va1j5jf8007t_state *state, int sleep)
 377 {
 378         u8 buf[2];
 379         struct i2c_msg msg;
 380
 381         buf[0] = 0x03;
 382         buf[1] = sleep ? 0x90 : 0x80;
 383
 384         msg.addr = state->config->demod_address;
 385         msg.flags = 0;
 386         msg.len = sizeof(buf);
 387         msg.buf = buf;
 388
 389         if (i2c_transfer(state->adap, &msg, 1) != 1)
 390                 return -EREMOTEIO;
 391
 392         return 0;
 393 }
 394
 395 static int va1j5jf8007t_sleep(struct dvb_frontend *fe)
 396 {
 397         struct va1j5jf8007t_state *state;
 398         int ret;
 399
 400         state = fe->demodulator_priv;
 401
 402         ret = va1j5jf8007t_init_frequency(state);
 403         if (ret < 0)
 404                 return ret;
 405
 406         return va1j5jf8007t_set_sleep(state, 1);
 407 }
 408
 409 static int va1j5jf8007t_init(struct dvb_frontend *fe)
 410 {
 411         struct va1j5jf8007t_state *state;
 412
 413         state = fe->demodulator_priv;
 414         state->tune_state = VA1J5JF8007T_IDLE;
 415
 416         return va1j5jf8007t_set_sleep(state, 0);
 417 }
 418
 419 static void va1j5jf8007t_release(struct dvb_frontend *fe)
 420 {
 421         struct va1j5jf8007t_state *state;
 422         state = fe->demodulator_priv;
 423         kfree(state);
 424 }
 425
 426 static const struct dvb_frontend_ops va1j5jf8007t_ops = {
 427         .delsys = { SYS_ISDBT },
 428         .info = {
 429                 .name = "VA1J5JF8007/VA1J5JF8011 ISDB-T",
 430                 .frequency_min = 90000000,
 431                 .frequency_max = 770000000,
 432                 .frequency_stepsize = 142857,
 433                 .caps = FE_CAN_INVERSION_AUTO | FE_CAN_FEC_AUTO |
 434                         FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO |
 435                         FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_HIERARCHY_AUTO,
 436         },
 437
 438         .read_snr = va1j5jf8007t_read_snr,
 439         .get_frontend_algo = va1j5jf8007t_get_frontend_algo,
 440         .read_status = va1j5jf8007t_read_status,
 441         .tune = va1j5jf8007t_tune,
 442         .sleep = va1j5jf8007t_sleep,
 443         .init = va1j5jf8007t_init,
 444         .release = va1j5jf8007t_release,
 445 };
 446
 447 static const u8 va1j5jf8007t_20mhz_prepare_bufs[][2] = {
 448         {0x03, 0x90}, {0x14, 0x8f}, {0x1c, 0x2a}, {0x1d, 0xa8}, {0x1e, 0xa2},
 449         {0x22, 0x83}, {0x31, 0x0d}, {0x32, 0xe0}, {0x39, 0xd3}, {0x3a, 0x00},
 450         {0x5c, 0x40}, {0x5f, 0x80}, {0x75, 0x02}, {0x76, 0x4e}, {0x77, 0x03},
 451         {0xef, 0x01}
 452 };
 453
 454 static const u8 va1j5jf8007t_25mhz_prepare_bufs[][2] = {
 455         {0x03, 0x90}, {0x1c, 0x2a}, {0x1d, 0xa8}, {0x1e, 0xa2}, {0x22, 0x83},
 456         {0x3a, 0x00}, {0x5c, 0x40}, {0x5f, 0x80}, {0x75, 0x0a}, {0x76, 0x4c},
 457         {0x77, 0x03}, {0xef, 0x01}
 458 };
 459
 460 int va1j5jf8007t_prepare(struct dvb_frontend *fe)
 461 {
 462         struct va1j5jf8007t_state *state;
 463         const u8 (*bufs)[2];
 464         int size;
 465         u8 buf[2];
 466         struct i2c_msg msg;
 467         int i;
 468
 469         state = fe->demodulator_priv;
 470
 471         switch (state->config->frequency) {
 472         case VA1J5JF8007T_20MHZ:
 473                 bufs = va1j5jf8007t_20mhz_prepare_bufs;
 474                 size = ARRAY_SIZE(va1j5jf8007t_20mhz_prepare_bufs);
 475                 break;
 476         case VA1J5JF8007T_25MHZ:
 477                 bufs = va1j5jf8007t_25mhz_prepare_bufs;
 478                 size = ARRAY_SIZE(va1j5jf8007t_25mhz_prepare_bufs);
 479                 break;
 480         default:
 481                 return -EINVAL;
 482         }
 483
 484         msg.addr = state->config->demod_address;
 485         msg.flags = 0;
 486         msg.len = sizeof(buf);
 487         msg.buf = buf;
 488
 489         for (i = 0; i < size; i++) {
 490                 memcpy(buf, bufs[i], sizeof(buf));
 491                 if (i2c_transfer(state->adap, &msg, 1) != 1)
 492                         return -EREMOTEIO;
 493         }
 494
 495         return va1j5jf8007t_init_frequency(state);
 496 }
 497
 498 struct dvb_frontend *
 499 va1j5jf8007t_attach(const struct va1j5jf8007t_config *config,
 500                     struct i2c_adapter *adap)
 501 {
 502         struct va1j5jf8007t_state *state;
 503         struct dvb_frontend *fe;
 504         u8 buf[2];
 505         struct i2c_msg msg;
 506
 507         state = kzalloc(sizeof(struct va1j5jf8007t_state), GFP_KERNEL);
 508         if (!state)
 509                 return NULL;
 510
 511         state->config = config;
 512         state->adap = adap;
 513
 514         fe = &state->fe;
 515         memcpy(&fe->ops, &va1j5jf8007t_ops, sizeof(struct dvb_frontend_ops));
 516         fe->demodulator_priv = state;
 517
 518         buf[0] = 0x01;
 519         buf[1] = 0x80;
 520
 521         msg.addr = state->config->demod_address;
 522         msg.flags = 0;
 523         msg.len = sizeof(buf);
 524         msg.buf = buf;
 525
 526         if (i2c_transfer(state->adap, &msg, 1) != 1) {
 527                 kfree(state);
 528                 return NULL;
 529         }
 530
 531         return fe;
 532 }